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Proceedings ArticleDOI

An Experimental Investigation of the Flow Characteristics in the Swirl Chamber of a C.I. Engine

About: The article was published on 1991-02-01. It has received 2 citations till now. The article focuses on the topics: Flow (mathematics).
Citations
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Journal ArticleDOI
TL;DR: In this article, the authors used the turbulence filter, phase averaging and proper orthogonal decomposition methods to decompose experimentally measured turbulent velocity fields in an SI engine and compared the results of each technique with each other.
Abstract: In this study, the turbulence filter, the phase averaging and the proper orthogonal decomposition methods are used to decompose experimentally measured turbulent velocity fields in an SI engine. The radial and circumferential turbulent velocity fields were measured using hot wire anemometer under motored conditions at different engine configurations. The decomposed results of each technique are compared with each other. In addition, the obtained organized and turbulence motions and their energy spectra are examined. Finally, coherent structures of velocity fields and their activities are investigated.

24 citations

Journal ArticleDOI
Ahmet Erdil1
TL;DR: In this article, the radial and circumferential turbulent velocity fields are measured using hot wire anemometer under motoring conditions at various engine configurations at different engine configurations and the wavelet transform has been applied to experimentally measured turbulent velocity field in an SI engine to extract information about coherent structures.
Abstract: The issue of decomposing in-cylinder flow into mean and turbulence velocities remains unresolved. Spark Ignition (SI) engine flows are inherently non-stationary because of the piston and valve motions. In SI engine combustion chamber, turbulence is superimposed on unsteady organised motion of a mean flow. These turbulent flows have been studied by time or ensemble averaging methods and low-pass, high-pass filter methods. In this study, wavelet transform has been applied to experimentally measured turbulent velocity field in an SI engine to extract information about coherent structures. The radial and circumferential turbulent velocity fields are measured using hot wire anemometer under motoring conditions at various engine configurations.
References
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Journal ArticleDOI
TL;DR: In this article, the compatibility of theories of turbulence with different turbulent flame models is discussed, and it is suggested that the turbulent Reynolds number, Rλ, of the reactants is an important controlling parameter in turbulent flame propagation.

228 citations

Journal ArticleDOI
TL;DR: In this article, a review of gas motion into, within, and out of the engine cylinder that governs combustion characteristics and breathing capabilities of spark-ignition engines and compressionignition or diesel engines is presented.
Abstract: The flow field within the cylinder of internal combustion engines is the most important factor controlling the combustion process. Thus it has a major impact on engine operation. This paper reviews those aspects of gas motion into, within, and out of the engine cylinder that govern the combustion characteristics and breathing capabilities of spark-ignition engines and compression-ignition or diesel engines. Necessary background information and reciprocating engine operating cycles, the primary effect of piston motion and the spark-ignition and diesel engine combustion processes is first summarized. Then the characteristics of flow through inlet and exhaust valves in four-stroke cycle engines, and through ports in the cylinder liner in two-stroke cycle engines are reviewed. The essential features of common in-cylinder flows - the large scale rotating flows set up by the conical intake jet, the creation and development of swirl about the cylinder axis, the flows produced during compression due to combustion chamber shape called squish, flow during the combustion process, and two-stroke scavenging flows - are then described. The turbulence characteristics of these flows are then defined and discussed. Finally, flow phenomena which occur near the walls, which are important to heat transfer and hydrocarbon emissions phenomena, are reviewed.

153 citations

Proceedings ArticleDOI
01 Feb 1976

140 citations

Proceedings ArticleDOI
TL;DR: In this article, an experiment is described for the direct measurement of the turbulent burning velocity during premixed combustion in a spark ignition engine using a high data rate laser Doppler velocimeter system that resolves the unburned gas motion on an individual cycle basis.
Abstract: An experiment is described for the direct measurement of the turbulent burning velocity during premixed combustion in a spark ignition engine The gas velocity is measured using a high data rate laser Doppler velocimeter system that resolves the unburned gas motion on an individual cycle basis The ensemble-averaged flame speed is determined from ionization probe measurements of the time of flame arrival at discrete positions along the path of flame propagation The difference between the cycle-resolved unburned gas velocity and the ensemble-averaged flame speed gives a direct measurement of the turbulent burning velocity that is unbiased by cycle variations in the combustion rate

39 citations